Question

which dispute with Britain was settled in 1846

Answer 1

The Oregon Treaty was signed in 1846 settling the dispute between Britain and the United States over the ownership of Oregon Country, which was in the Pacific Northwest area of America. Since the Treaty of 1818, Oregon Country was co-owned by Britain and the U.S.  

Answer 2

The despite that was settled in Britain in the year 1846 June 15 was the Oregon Treaty. The treaty brought an end to the Oregon boundary dispute by settling competing American and British claims to the Oregon Country.